[Feature] API version should be dynamic ?

[AvinashDalvi89]

What Would You Like to See with the Gateway?

As a user, the AI model API version should have dynamic parameters like a model. 
Currently,

gateway/src/providers/google/api.ts

Line 4 in 27a6ebb

getBaseURL: () => 'https://generativelanguage.googleapis.com/v1beta',

is hardcoded. Due to this, we can't test an older model or another version of the of the model. It will be good to have it as a param. 

Context for your Request

This feature will give users the benefit of switching to any AI model API version. For example, Google Gemini has the v1 beta version supported, but tomorrow they will introduce a new version, and then the Portkey gateway will need to update. Instead of this, give dynamic parameters so that the code dependency for the AI model API version change will be removed. 

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